feat(_comp_expand_glob): fail when no paths are generated

bash_completion

@@ -325,6 +325,8 @@ _comp_upvars()
 #   parameter expansions, command substitutions, and other expansions will be
 #   processed.  The user-provided strings should not be directly specified to
 #   this argument.
+# @return 0 if at least one path is generated, 1 if no path is generated, or 2
+#   if the usage is incorrect.
 # @since 2.12
 _comp_expand_glob()
 {
@@ -361,7 +363,7 @@ _comp_expand_glob()
     [[ :$_original_opts: == *:nullglob:* ]] || shopt -u nullglob
     [[ :$_original_opts: == *:failglob:* ]] && shopt -s failglob
     [[ :$_original_opts: == *:noglob:* ]] && set -o noglob
-    return 0
+    eval "((\${#$1[@]}))"
 }
 
 # Split a string and assign to an array.  This function basically performs
@@ -1652,14 +1654,12 @@ _comp_compgen_configured_interfaces()
     local -a files
     if [[ -f /etc/debian_version ]]; then
         # Debian system
-        _comp_expand_glob files '/etc/network/interfaces /etc/network/interfaces.d/*'
-        ((${#files[@]})) || return 0
+        _comp_expand_glob files '/etc/network/interfaces /etc/network/interfaces.d/*' || return 0
         _comp_compgen -U files split -- "$(command sed -ne \
             's|^iface \([^ ]\{1,\}\).*$|\1|p' "${files[@]}" 2>/dev/null)"
     elif [[ -f /etc/SuSE-release ]]; then
         # SuSE system
-        _comp_expand_glob files '/etc/sysconfig/network/ifcfg-*'
-        ((${#files[@]})) || return 0
+        _comp_expand_glob files '/etc/sysconfig/network/ifcfg-*' || return 0
         _comp_compgen -U files split -- "$(printf '%s\n' "${files[@]}" |
             command sed -ne 's|.*ifcfg-\([^*].*\)$|\1|p')"
     elif [[ -f /etc/pld-release ]]; then
@@ -1668,8 +1668,7 @@ _comp_compgen_configured_interfaces()
             command sed -ne 's|.*ifcfg-\([^*].*\)$|\1|p')"
     else
         # Assume Red Hat
-        _comp_expand_glob files '/etc/sysconfig/network-scripts/ifcfg-*'
-        ((${#files[@]})) || return 0
+        _comp_expand_glob files '/etc/sysconfig/network-scripts/ifcfg-*' || return 0
         _comp_compgen -U files split -- "$(printf '%s\n' "${files[@]}" |
             command sed -ne 's|.*ifcfg-\([^*].*\)$|\1|p')"
     fi
@@ -1951,8 +1950,7 @@ _comp_compgen_xinetd_services()
     local xinetddir=${_comp__test_xinetd_dir:-/etc/xinetd.d}
     if [[ -d $xinetddir ]]; then
         local -a svcs
-        _comp_expand_glob svcs '$xinetddir/!($_comp_backup_glob)'
-        if ((${#svcs[@]})); then
+        if _comp_expand_glob svcs '$xinetddir/!($_comp_backup_glob)'; then
             _comp_compgen -U svcs -U xinetddir -- -W '"${svcs[@]#$xinetddir/}"'
         fi
     fi
@@ -2018,10 +2016,11 @@ _comp__init_set_up_service_completions()
     local sysvdirs svc svcdir svcs
     _comp_sysvdirs &&
         for svcdir in "${sysvdirs[@]}"; do
-            _comp_expand_glob svcs '"$svcdir"/!($_comp_backup_glob)'
-            for svc in "${svcs[@]}"; do
-                [[ -x $svc ]] && complete -F _comp_complete_service "$svc"
-            done
+            if _comp_expand_glob svcs '"$svcdir"/!($_comp_backup_glob)'; then
+                for svc in "${svcs[@]}"; do
+                    [[ -x $svc ]] && complete -F _comp_complete_service "$svc"
+                done
+            fi
         done
     unset -f "$FUNCNAME"
 }
@@ -2355,8 +2354,7 @@ _comp_compgen_terms()
         {
             toe -a || toe
         } | _comp_awk '{ print $1 }'
-        _comp_expand_glob dirs '/{etc,lib,usr/lib,usr/share}/terminfo/?'
-        ((${#dirs[@]})) &&
+        _comp_expand_glob dirs '/{etc,lib,usr/lib,usr/share}/terminfo/?' &&
             find "${dirs[@]}" -type f -maxdepth 1 |
             _comp_awk -F / '{ print $NF }'
     } 2>/dev/null)"
@@ -2455,9 +2453,8 @@ _comp__included_ssh_config_files()
                 i="${relative_include_base}/${i}"
             fi
             _comp_expand_tilde "$i"
-            _comp_expand_glob files '$REPLY'
-            # In case the expanded variable contains multiple paths
-            if ((${#files[@]})); then
+            if _comp_expand_glob files '$REPLY'; then
+                # In case the expanded variable contains multiple paths
                 for f in "${files[@]}"; do
                     if [[ -r $f && ! -d $f ]]; then
                         config+=("$f")
@@ -2592,8 +2589,7 @@ _comp_compgen_known_hosts__impl()
         done
         for i in /etc/ssh2/knownhosts ~/.ssh2/hostkeys; do
             [[ -d $i ]] || continue
-            _comp_expand_glob tmpkh '"$i"/*.pub'
-            ((${#tmpkh[@]})) && khd+=("${tmpkh[@]}")
+            _comp_expand_glob tmpkh '"$i"/*.pub' && khd+=("${tmpkh[@]}")
         done
     fi
 

completions/_rtcwake

@@ -17,8 +17,7 @@ _comp_cmd_rtcwake()
             return
             ;;
         --device | -d)
-            _comp_expand_glob COMPREPLY '/dev/rtc?*'
-            ((${#COMPREPLY[@]})) &&
+            _comp_expand_glob COMPREPLY '/dev/rtc?*' &&
                 _comp_compgen -- -W '"${COMPREPLY[@]#/dev/}"'
             return
             ;;

completions/_yum

@@ -33,8 +33,7 @@ _comp_cmd_yum__compgen_repolist()
 _comp_cmd_yum__compgen_plugins()
 {
     local -a files
-    _comp_expand_glob files '/usr/lib/yum-plugins/*.py{,c,o}'
-    ((${#files[@]})) || return
+    _comp_expand_glob files '/usr/lib/yum-plugins/*.py{,c,o}' || return
     _comp_compgen -U files split -- "$(
         printf '%s\n' "${files[@]}" |
             command sed -ne 's|.*/\([^./]*\)\.py[co]\{0,1\}$|\1|p' | sort -u

completions/dpkg

@@ -157,8 +157,7 @@ _comp_cmd_dpkg_reconfigure()
     # shellcheck disable=SC2254
     case $prev in
         --frontend | -${noargopts}f)
-            _comp_expand_glob opt '/usr/share/perl5/Debconf/FrontEnd/*'
-            if ((${#opt[@]})); then
+            if _comp_expand_glob opt '/usr/share/perl5/Debconf/FrontEnd/*'; then
                 opt=("${opt[@]##*/}")
                 opt=("${opt[@]%.pm}")
                 _comp_compgen -- -W '"${opt[@]}"'

completions/hcitool

@@ -337,8 +337,7 @@ _comp_cmd_hciattach()
         _comp_count_args
         case $REPLY in
             1)
-                _comp_expand_glob COMPREPLY '/dev/tty*'
-                ((${#COMPREPLY[@]})) &&
+                _comp_expand_glob COMPREPLY '/dev/tty*' &&
                     _comp_compgen -- -W '"${COMPREPLY[@]}"
                         "${COMPREPLY[@]#/dev/}"'
                 ;;

completions/hunspell

@@ -11,8 +11,7 @@ _comp_cmd_hunspell()
             ;;
         -d)
             local -a dicts
-            _comp_expand_glob dicts '/usr/share/hunspell/*.dic /usr/local/share/hunspell/*.dic'
-            if ((${#dicts[@]})); then
+            if _comp_expand_glob dicts '/usr/share/hunspell/*.dic /usr/local/share/hunspell/*.dic'; then
                 dicts=("${dicts[@]##*/}")
                 dicts=("${dicts[@]%.dic}")
                 _comp_compgen -- -W '"${dicts[@]}"'

completions/info

@@ -53,10 +53,7 @@ _comp_cmd_info()
     if ((${#infopath[@]})); then
         _comp_compgen -Rv infopath -- -S "/$cur*" -W '"${infopath[@]}"'
         local IFS=
-        _comp_expand_glob COMPREPLY '${infopath[@]}'
-        _comp_unlocal IFS
-
-        if ((${#COMPREPLY[@]})); then
+        if _comp_expand_glob COMPREPLY '${infopath[@]}'; then
             # weed out directory path names and paths to info pages (empty
             # elements will be removed by the later `compgen -X ''`)
             COMPREPLY=("${COMPREPLY[@]##*/?(:)}")
@@ -65,6 +62,7 @@ _comp_cmd_info()
             # weed out info dir file with -X 'dir'
             _comp_compgen -c "${cur//\\\\/}" -- -W '"${COMPREPLY[@]%.*}"' -X '@(|dir)'
         fi
+        _comp_unlocal IFS
     fi
 } &&
     complete -F _comp_cmd_info info pinfo

completions/ipmitool

@@ -17,8 +17,7 @@ _comp_cmd_ipmitool()
             ;;
         -*d)
             local -a files
-            _comp_expand_glob files '/dev/ipmi* /dev/ipmi/* /dev/ipmidev/*'
-            ((${#files[@]})) &&
+            _comp_expand_glob files '/dev/ipmi* /dev/ipmi/* /dev/ipmidev/*' &&
                 _comp_compgen -- -W '"${files[@]##*([^0-9])}"' -X '![0-9]*'
             return
             ;;

completions/java

@@ -116,8 +116,7 @@ _comp_cmd_java__packages()
     # parse each sourcepath element for packages
     for i in "${sourcepaths[@]}"; do
         if [[ -d $i ]]; then
-            _comp_expand_glob files '"$i/$cur"*'
-            ((${#files[@]})) || continue
+            _comp_expand_glob files '"$i/$cur"*' || continue
             _comp_split -la COMPREPLY "$(
                 command ls -F -d "${files[@]}" 2>/dev/null |
                     command sed -e 's|^'"$i"'/||'

completions/lintian

@@ -3,8 +3,7 @@
 _comp_cmd_lintian__tags()
 {
     local search tags check_files
-    _comp_expand_glob check_files '/usr/share/lintian/checks/*.desc'
-    ((${#check_files[@]})) || return 0
+    _comp_expand_glob check_files '/usr/share/lintian/checks/*.desc' || return 0
 
     tags=$(_comp_awk '/^Tag/ { print $2 }' "${check_files[@]}")
     if [[ $cur == *, ]]; then
@@ -23,8 +22,7 @@ _comp_cmd_lintian__tags()
 _comp_cmd_lintian__checks()
 {
     local match search todisable checks check_files
-    _comp_expand_glob check_files '/usr/share/lintian/checks/*.desc'
-    ((${#check_files[@]})) || return 0
+    _comp_expand_glob check_files '/usr/share/lintian/checks/*.desc' || return 0
 
     checks=$(_comp_awk '/^(Check-Script|Abbrev)/ { print $2 }' \
         "${check_files[@]}")
@@ -49,8 +47,7 @@ _comp_cmd_lintian__checks()
 _comp_cmd_lintian__infos()
 {
     local search infos collection_files
-    _comp_expand_glob collection_files '/usr/share/lintian/collection/*.desc'
-    ((${#collection_files[@]})) || return 0
+    _comp_expand_glob collection_files '/usr/share/lintian/collection/*.desc' || return 0
 
     infos=$(_comp_awk '/^Collector/ { print $2 }' \
         "${collection_files[@]}")

completions/man

@@ -81,17 +81,15 @@ _comp_cmd_man()
         _comp_compgen -aRv manfiles -- -S "/*cat$sect/$cur*" -W '"${manpath[@]}"'
 
         local IFS=
-        _comp_expand_glob COMPREPLY '${manfiles[@]}'
-        _comp_unlocal IFS
-
-        if ((${#COMPREPLY[@]} != 0)); then
+        if _comp_expand_glob COMPREPLY '${manfiles[@]}'; then
             # weed out directory path names and paths to man pages (empty
             # elements will be removed by the later `compgen -X ''`)
             COMPREPLY=("${COMPREPLY[@]##*/?(:)}")
             # strip suffix from man pages
             COMPREPLY=("${COMPREPLY[@]%$comprsuffix}")
             _comp_compgen -c "${cur//\\\\/}" -- -W '"${COMPREPLY[@]%.*}"' -X ''
         fi
+        _comp_unlocal IFS
     fi
 
     # shellcheck disable=SC2053

completions/minicom

@@ -17,8 +17,7 @@ _comp_cmd_minicom()
             return
             ;;
         --ptty | -${noargopts}p)
-            _comp_expand_glob COMPREPLY '/dev/tty*'
-            ((${#COMPREPLY[@]})) &&
+            _comp_expand_glob COMPREPLY '/dev/tty*' &&
                 _comp_compgen -- -W '"${COMPREPLY[@]}" "${COMPREPLY[@]#/dev/}"'
             return
             ;;
@@ -33,8 +32,7 @@ _comp_cmd_minicom()
     fi
 
     local -a files
-    _comp_expand_glob files '{/etc/,/etc/minicom/,~/.}minirc.?*'
-    ((${#files[@]})) &&
+    _comp_expand_glob files '{/etc/,/etc/minicom/,~/.}minirc.?*' &&
         _comp_compgen -- -W '"${files[@]##*minirc.}"'
 } &&
     complete -F _comp_cmd_minicom -o default minicom

completions/pkgadd

@@ -40,8 +40,7 @@ _comp_cmd_pkgadd()
             else
                 local -a pkginst_list
                 if [[ -d $device ]]; then
-                    _comp_expand_glob pkginst_list '"$device"/*/pkginfo'
-                    if ((${#pkginst_list[@]})); then
+                    if _comp_expand_glob pkginst_list '"$device"/*/pkginfo'; then
                         pkginst_list=("${pkginst_list[@]#"$device/"}")
                         pkginst_list=("${pkginst_list[@]%/pkginfo}")
                     fi

completions/ps

@@ -38,8 +38,7 @@ _comp_cmd_ps()
             return
             ;;
         ?(-)t | [^-]*t | --tty)
-            _comp_expand_glob COMPREPLY '/dev/tty*'
-            ((${#COMPREPLY[@]})) &&
+            _comp_expand_glob COMPREPLY '/dev/tty*' &&
                 _comp_compgen -- -W '"${COMPREPLY[@]}" "${COMPREPLY[@]#/dev/}"'
             return
             ;;

completions/qemu

@@ -21,8 +21,7 @@ _comp_cmd_qemu()
             ;;
         -k)
             local -a keymaps
-            _comp_expand_glob keymaps '/usr/{local/,}share/qemu/keymaps/!(common|modifiers)'
-            ((${#keymaps[@]})) &&
+            _comp_expand_glob keymaps '/usr/{local/,}share/qemu/keymaps/!(common|modifiers)' &&
                 _comp_compgen -- -W '"${keymaps[@]##*/}"'
             return
             ;;

completions/screen

@@ -28,8 +28,7 @@ _comp_cmd_screen__sessions()
 
         if ((cword == 1)); then
             if [[ $cur == /dev* ]]; then
-                _comp_expand_glob COMPREPLY '/dev/serial/*/* /dev/ttyUSB* /dev/ttyACM*'
-                ((${#COMPREPLY[@]})) &&
+                _comp_expand_glob COMPREPLY '/dev/serial/*/* /dev/ttyUSB* /dev/ttyACM*' &&
                     _comp_compgen -- -W '"${COMPREPLY[@]}"'
                 return
             fi

completions/ssh

@@ -522,8 +522,7 @@ _comp_xfunc_scp_compgen_local_files()
     fi
 
     local files
-    _comp_expand_glob files '"$cur"*'
-    ((${#files[@]})) || return 0
+    _comp_expand_glob files '"$cur"*' || return 0
     if [[ $_dirsonly ]]; then
         _comp_compgen -U files split -l -- "$(
             command ls -aF1dL "${files[@]}" 2>/dev/null |

completions/valgrind

@@ -29,8 +29,7 @@ _comp_cmd_valgrind()
             # Tools seem to be named e.g. like memcheck-amd64-linux from which
             # we want to grab memcheck.
             local -a files
-            _comp_expand_glob files '/usr{,/local}/lib{,64,exec}{/*-linux-gnu,}/valgrind/*'
-            if ((${#files[@]})); then
+            if _comp_expand_glob files '/usr{,/local}/lib{,64,exec}{/*-linux-gnu,}/valgrind/*'; then
                 _comp_compgen_split -- "$(
                     for f in "${files[@]}"; do
                         [[ $f != *.so && -x $f && $f =~ ^.*/(.*)-[^-]+-[^-]+ ]] &&

completions/vpnc

@@ -65,8 +65,7 @@ _comp_cmd_vpnc()
     else
         # config name, /etc/vpnc/<name>.conf
         local -a configs
-        _comp_expand_glob configs '/etc/vpnc/*.conf'
-        if ((${#configs[@]})); then
+        if _comp_expand_glob configs '/etc/vpnc/*.conf'; then
             configs=("${configs[@]##*/}")
             configs=("${configs[@]%.conf}")
             compopt -o filenames

completions/xdg-mime

@@ -52,8 +52,7 @@ _comp_cmd_xdg_mime()
         default)
             if ((args == 2)); then
                 local -a desktops
-                _comp_expand_glob desktops '/usr/share/applications/*.desktop'
-                if ((${#desktops[@]})); then
+                if _comp_expand_glob desktops '/usr/share/applications/*.desktop'; then
                     desktops=("${desktops[@]##*/}")
                     _comp_compgen -- -W '"${desktops[@]}"'
                 fi